<div id="bulk_delete">
    <div class="bulk_checkbox" style="display: none;" ><input type="checkbox" > 全选</div>
    <div class="define_delete " style="display:none;"><button class="btn btn-danger"><i class="fa fa-trash-o" aria-hidden="true"></i> 确定删除</button></div>
    <div class="bulk_delete" ><button class="btn btn-default">批量删除</button ></div>
</div>